| 摘要 |
A system for apportioning the operating costs of a central, constant-temperature, constant-pressure, variable-volume air conditioning or heating system among its multiple users. Meters at each unit measure the cumulative volume of air received on thermostatically controlled demand by each user's unit during a given period, and the total operating cost for that period is prorated among the users in the proportion that the total volume of air received by each unit bears to the total volume of air used by all of the units during the same period. The total volume used by all of the units may be measured by metering the total volume of air put out by the central delivery system, or determined by taking the sum of the volumes received by all of the units.
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